<p>Changes the opacity of the cell view's <code>$el</code>.</p>

<p>When a cell is highlighted with the opacity highlighter, its <code>$el</code> is given the <code data-lang="css">.joint-highlight-opacity</code> class. To customize the look of this highlighted state, you can add custom CSS rules that affect this class name.</p>

<p>This highlighter does not currently have any options.</p>

<p>Example usage:</p>
<pre><code>cellView.highlight(null/* defaults to cellView.el */, {
    highlighter: {
        name: 'opacity'
    }
});</code></pre>
